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Debt and Other Financing (Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jul. 31, 2019
Dec. 31, 2016
Aug. 31, 2016
Mar. 31, 2015
Mar. 31, 2013
Debt maturing within one year:                  
Short term debt $ 28.0   $ 1.8            
Short term related party loans 1,008.6   0.0            
Total 1,036.6   1.8            
Long-term debt:                  
Finance lease liabilities 1.5   1.4            
Total 675.4   1,590.4            
6.50% Senior Secured Notes, due August 2022                  
Long-term debt:                  
Senior Secured Notes $ 0.0   392.6            
Interest rate, stated percentage 6.50%                
7.875% Senior Secured Notes, due August 2022 (2016 Notes)                  
Long-term debt:                  
Senior Secured Notes $ 0.0   495.8            
Interest rate, stated percentage 7.875%           7.875%    
5.00% Notes, due March 2023                  
Long-term debt:                  
Notes $ 460.1   459.3            
Interest rate, stated percentage 5.00%       5.00% 5.00%   5.00% 5.00%
6.95% Notes, due March 2043                  
Long-term debt:                  
Notes $ 213.8   $ 241.3            
Interest rate, stated percentage 6.95% 6.95%   6.95%   6.95%     6.95%